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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '391fdcfcbe5b6ec5c6bdac10ed54f9912c520d68630ee7d155144b5bba0a1e16' 
  AND token = 'RBjDByCsV+xOM2zdTRApnhR2oOVW+Sg0cdvJeit+Qto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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