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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b121713a252f807da16c72fcb32eb306ae85b637320de511ed1712db588179d' 
  AND token = 'oZ+CKM8rkVCwK5YottsOWOVkCMhfRSZMXOeeOZKJ8V0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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