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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2931d322bc2c8db2ac920122145719ccc5ee1a06433487d9d031e7482b38b9b' 
  AND token = '+BbueOF+EsNLLA96ZqSS49S9NnBtmScrzHzbfcLiY18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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