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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8abefbe310cff5b6cebb3a2dcaf2a56109d8af7cdd1e0df49f41a40952bc6e5' 
  AND token = 'EB8/F4ku4T8IsjiIKfOT7oldT96ETs0YLhhp04vXhPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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