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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6b065a930c36de48c494f6c70ab8c530e26ce8461b41791b54ad5aba9c88bd8' 
  AND token = 'At8l1KHb3w/UjmZrrJKH2fQpDxNO2LqgK0Ld1tNZ8UQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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