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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c06d497e5323134bd7e3e633eda00ea282927bcb0e52d37730332daec504e8cb' 
  AND token = 'G9UxHMlIuvp3R/CIbn1F/Dvty2B6cEFhsSRShbG+C6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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