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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d9ac1e322373e162896e9352421717d1bb91e3dcc2edc42ad8edf1e37638403' 
  AND token = 'mSh5UQ5mkor/kseE23nkkOmymZ3zh5OcWaJ0ONYIasY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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