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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96ced3aef3793d09e479510b1542f4bba3f0fc8e53073ff6620d31c7f9b67ec4' 
  AND token = '0iKqOwhG5ueOiQwrdhN0HDHblxbp1iqIuuyqLkif8cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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