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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8912214c484ff9e3398ac850117ccaa16fc62af92d67163e5bdcda9dd4255ff' 
  AND token = 'tqrneItFonuzM5w3Ux26U4rgpEcC7Q3IPnN0GeYJe1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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