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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13319045dc62aefd9eef8256195162f5f5d13e969b8198da8985ce8a51c04ff8' 
  AND token = 'MukjtAuzM6livOqWn/va4TuIQcbluwSo80ZkRo09E+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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