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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a54feca02c0362e08e7d6fc8304e36627c951106a29d91f3a87cf07b28d5798' 
  AND token = '4WjAsGMrScrFbSsv/k2aLpxx/r7ejyHgNt927XB4avc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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