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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fdf982d426a30127c54f44e38643e885a7223701bf25fe8574d046b8d09d317' 
  AND token = 'tpy3cGzKO+9z0FNI8CnRoX3AwMzyho3AI1aERx0p+1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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