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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbf66eae6c1c768942f80fa00c70bbf2cd707a9187d701383a3c8823bd7b8dab' 
  AND token = 'fmXJKgCenl4DuqXt2g6fr/MwgHLlPHToewf9DYjaRIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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