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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9571fe739cd800d6ffcc3cdff7c30f22e2439e52542028c76b3daf208d1502d3' 
  AND token = 'pM1QWjcM7Do6CwyDNGDGv9wcE0xZhGPSIWQhxD2uFs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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