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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75c402472c7e8170289b447e43f183d2530c54cd706487885d10028d93f5f5ff' 
  AND token = 'xfx+r3Fzp3kPcP5/IxaeT3jVolNE08MHbehfU4oIKeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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