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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9faa4170761d35615c4a5a4657c5ce8018d2c381d52f2cd3c9fc226dfc4d0c4a' 
  AND token = 'vEv7sLcNxhxlZMWFCc1XltOWd2U3Ci600/Mi9JBEEg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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