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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '397a81d00755defcd84c70fdc4817b0dc1f9c8dfb11298539b7b7e5f4c4d7788' 
  AND token = 'hbB1oZrZwaEA0ROwu6pLhomjkBkS4IU2SMf3CglqE1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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