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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3be85dbc0f4fb38090746965e5896e00d14144e57965fb5063e734532737ce80' 
  AND token = 'pgdqXzuYfRDnPhggUYkgTibt57ej+7KK4jWGrdbeqFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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