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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86e4cd1572c0e81572c93fb447d9953308f58da7b043aaa8dec8855ac43e59e6' 
  AND token = 'GC1zTXtFX97fcaUrr0j3A00Ej9PN/cNhKahphdi6aaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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