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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbacb9c17c67a6f2531fce883794d599ed15b109e8698da521041fd015d277a9' 
  AND token = 'aUUq7ktMqJKspClNxpekjRqk/L8C5kcT+Tb8jwhIn6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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