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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dff6e2f5fd31dc4488001d086258be8394ec762226e62c0563e847a63955c99' 
  AND token = 'TIWUy/dIjrikkQo/aX1NNLwiGMUaKI5RzjuYccGMwTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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