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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85bc08b7f44c78cdd333d17b40f6d4e30d31cb4940ea7dd6b36cbf6fe4d2215e' 
  AND token = 'MHbMPB5u8o67o1L6HZ5+6qyQ9oa1VEt3lif49RZLJ6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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