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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdaec17f997e60dd743de5ac05c8e52b3e3525dc1228d1289b3662bc145cd2a4' 
  AND token = 'FnttOOP2Dm7IhUQfCpBXpcLaBQDBf5Vgf37+0QQbzb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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