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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '737df764959b5d36af5cea7b65ef22c2cfd18dec40bff4ef4a29c147a46d9a0e' 
  AND token = 'VTRk9iAfHGfR27lM1Ikr2Ht0HkDGTdve1BFForBqD8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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