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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '968b80df2d29dd879f6ae5df50c39922b3ba59c5c4b160a3318fe233338c8539' 
  AND token = '5hzgl9kpdHiS4zUcF02jNm6kAH6wCq5n4fwX8sims/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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