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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '971469c88feede4aee0c017279b0da3b752adf0e3fa6051869ee3d57a2d8eaa0' 
  AND token = 'A9WVKWH+CiuHG52Qjvahyp2na32Q4zWEonN7QW33J18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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