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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20817ccfd9bc99e4c2d4859bdb1185d5d05bbcda8f4562338b13bbf3c6b5e473' 
  AND token = 'lX4t1bHgrQt9qz18u5ViaIJcZEelMIfiRkC+tdJT7sE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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