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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa64bf269b5690f5245a2581663b17f89f8487240ee5d0d71c7fc0ee1839c5a9' 
  AND token = 'qv2XBWiZGuAM9VxSl4L1GuFqZpSW6wR6472SePWCy9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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