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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff9e4689bc1f6bdcc2f8534c4b2aabbbdb1734e182fbef9b64e8d9a67733caf6' 
  AND token = 'ukYPRcYHE703UZDSF7zgs5q+33TsNAwWH4RH/6S8WAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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