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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '124946247677b2e78650d6aeb541fef2ff85375d35a059c9c1bc525efa949b7c' 
  AND token = 'Jjhoxl/WuMaMWQ65u1QvR4yTxipigOwlT1XwerR/qxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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