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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84fb0d46830858665e8181c3900a76af712a4aac1d0b8796cb747ffe92bb040c' 
  AND token = 'FhY+SYagreeYFdt55qfjDrrfAcQyLRf2YajpFI7zVvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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