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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69a29c38c1a8eb015e403731a971df3f3b883ef41ba25856066ba0160e711e98' 
  AND token = '4FAzrqs2PSp9KLXVeiD81QdlLXI0EAB8sF2boPhUwqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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