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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6241df9d5ec10cfbb6c646daf8e1ffbedb9186ff8ba612b19208fecddf654d14' 
  AND token = 'VRqj/hP3Gottwr5Fjxh3KA98Kd4avWoBxvKVPBlBHO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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