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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd3c63ab6491d6caa25e2b11e5b898bd0d51e7cee03c4e6f39847048b6df1540' 
  AND token = 'n8LsGPUaLlVrzZbo4C0bysr5UtKytoRXt5GzXeA9mDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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