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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cd522e45e881db62abedad9ec4ce76552cba7e46d6c810cf8b5b2ad55db4bc4' 
  AND token = 'r7cD8xljPoNMJElUC3NzxBn6iVXt2Q5XRSiPXallqsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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