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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e8123393615c3a7f7a8b142e6d9c413231a168eccb1c425221646c0550267d2' 
  AND token = 'c1A4dtCRnCXvJad0C2ybm6E/QaJS9dYtb/uCSyuJVso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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