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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e80008b929577941ca235d49837034adca257d1bf56fd5d937ef9545ec5e48e' 
  AND token = '5Jrqnn8b6qQ3+8liXxvuxs8f6mAwGDbTi4GWe1oQ9DM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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