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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '870c92da328ffd65f92fd10bd8cf5540a94f89aa3292c35e4e3a58812b2d6a30' 
  AND token = '71wG9fdjl2bwZ24G2n998SMitXIiMuJEaKf8Du+OlCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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