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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe8bb56e60780e7420db7cd043a9f7b84de48cc99348d20632e447e3ee383ea7' 
  AND token = 'A9enVpyJyWNl5SoO2SGij7Z/ZAYWh3yB+gFVZHr3xQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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