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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23a23f02efff6e5919a727a57f3b001a10ea569e243ac19bd1e37b72d35cf0b8' 
  AND token = '8rGdjr9ivDaMY8YqqOnvJNQY2DHUpgcPMooePIJVUoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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