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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0c08bd97b97eb0d418dc4fbbe22c35caf55e40415f850f5c04e9b03d0b33e03' 
  AND token = '3yo7gm75zFpcu+tnoCetuoakhCCKgzmtx9/LYouxuHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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