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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0993bb33c7e22c76c79d877ab0b96a7be0da3be99c45842092ba9a4498986ec' 
  AND token = 'NgJVMSpXFFJGestK8kQsnDjnwiykXfXe36Q/CNuZhxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}