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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e82529f86ec616cd6c3d02ae665996854078518d134f7d5b9ffe84543d56d1fb' 
  AND token = 'Xt0cmtgdkTBiCvYZans/fTS3wi9ONfjEQ6H13Fj1aJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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