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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad6984dc751aa01ea0fe81ee06adda492e132fd2a98e69620a1ad8f78f293741' 
  AND token = 'Bg242YtjhHscHJtnkm8tSswkBawNkP6h/lKuJLzNDDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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