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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '401971c5d54cf4953ed4afced76e64b41065de1a6f9032678ddbc9be8669e925' 
  AND token = 'zk0FjkqFXuR0bUMXh3U3guSEgczDdwHLERdo2wGy2cE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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