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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76c175ce0abe2a3a9c78582bab7e4c65a34b7e29db1dae952bbc558ca48cc5a0' 
  AND token = 'KcqWwRBTemyV4L13xGqakdzJPuslEoBjfGrRjaGbydU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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