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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff2becc4052c0bf0fc1da9055d32b25f1c6b04aa85dc15e51b2c510e55939f29' 
  AND token = '5cVO9nXCokyy0v/93mUIV2GhDs7wDMLiDsUxtIafLME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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