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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5e48bb7bd52f5b3c2d3847c84946cef198a659d8641194b113b89bc5726395e' 
  AND token = '6z1KiksjuHovey2NOVuK9dkGhGdZvOHD3+G1Xya1yWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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