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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97fe9872ac9d6eed9ba9ca38f60b73708cf731e84cac8fc7c2b9c9ded55bdbb0' 
  AND token = 'yVUYAZMdrCJAt9kWArGox7CcdLN0IdXqNT6aUKmsZvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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