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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fdfb58b44458372417689ac7ec7fa458ce98648925864d8fd4e889fb297cc7c' 
  AND token = 'qJ0CX5Ml/b4A7dVSWMT413hjU0f0auq+Kd8aONH7bdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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