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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87f55149020b577334a3e17558a99cf23e8682c58a8d81bb00a0b6d01ffba633' 
  AND token = 'U+iEowvW6kQtZciAGc5wh/x8wwt7eEg+M0yA0UIOp2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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