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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76a75bcce947b01d92cf5249d6b25f50d36d36a8bf53df39e64852985ac57484' 
  AND token = '44u8WOsGKEg/T8Pbj06CV5gwniX65xmmETQEirGKdik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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