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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '404fa980a0d389f630729a006980666aec392982db35b4017345658871fc0b8a' 
  AND token = 'PKTewjaIH76D7vKWXyH1v3tmJm0mKLtb87bpRpsGZa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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